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120                               SHIPPING PRACTICE

practical impossibility to right the ship to her original level,
but in the last sketch where shifting boards are shown,
it wiH be seen that although the vessel has listed and
the cargo moved, the weight of the cargo is still evenly
distributed, and the vessel will then regain her level

In grain cargoes also, the master usually has the right to
demand a certain quantity of the cargo in bags, which
he may stow in between the bulk cargo thus forming
divisions as an alternative, or assistance, to shifting
boards, if these are not compulsorily required.

This shifting of cargo not only applies to grain but to
many other types of cargo such as ores, flint stones, or small

Holds may become tainted by the carrying of certain
types of cargo, and be deemed unseaworthy for the recep-
tion of other cargo until all trace of the original cargo has
been removed. It has already been mentioned that when
cattle have been carried and foot and mouth disease has
broken out, a ship is unseaworthy to load other cattle until
such time as all trace of the disease has been removed and
the vessel satisfactorily fumigated.

Any cargo which has a distinct odour should either be
refused or carried only on deck, otherwise it will be found
that by its nature it will throw off its odours, and other
cargo stowed in the same space will become tainted by such
odour. Any type of cargo containing creosote, as creosote
in drums, or creosoted sleepers, has an effect on other
cargo shipped in the same hold which when discharged will
more often than not be found to have become tainted by
the odour of the creosote. In addition to this there are
many cargoes which are known for their natural tendency
to affect other cargoes. Special provision should be made
for the carriage of such dirty cargo.

Provisions, butter, or any cargo which may be liable to
melt or deteriorate if placed in contact with heat, should be
stowed well away from boilers or parts of the ship which
may be affected by heat from the ship's engines. The